Engine-valve.



G. P. ABORN.

ENGINE VALVE.

APPLIOArIoN FILED 001:19, 1912.

G. P. ABORN.

ENGINE VALVE.

APPLICATION FILED 001.19, 1912.

l, 1 02,180. Patented June 30,1914.

2 SHEETS-SHEET 2.

coLuMBIA PLANOGRAPM to.. WASNINUTON, D. Cv

UNTED STATESl PATENT OFFICE.

GEORGE P. ABORN, OF BROOKLINE, MASSACHUSETTS, ASSIGNOR TO BLAKE 6c KNOWLES STEAM :PUMP WORKS, A CORPORATION OF` NEW JERSEY.

ENGINE-VALVE.

Specification of Letters Patent.

Patented June 30, 1914;.

Application filed October 19, 1912. Serial No. 726,829.

T0 all whom t may concern.'

Be it known that I, Grenen P. AnonN, a citizen ol the United States, residing' at Fufooklinen county oil? Norfolk, and State of llflassaclu'lsetts, have invented certain new and useful Iu'iprovements in Engine-Valves, lully described and represented in the lollowing specification and the accompanying drawings7 forming a part of the same.

This invention relates generally to steam engines and pumps, and more particularly to engines equipped with Huid-actuated valves'ot the general class shown and described vin Letters Patent to Hall, Nos. 737,609 and 737,610.

One object of the invention is to secure economy in steam consumption by working the steam expansively.

Another object, when the invention 'is used in connection with pumps7 is to slow down the piston stroke near its end, to allow the valves in the pump cylinder to seat quietly and with little shock7 and to allow an easier reversal of the piston stroke.

Another object .is to secure a simpler t'orm ot mechanism to etl'ect these results than has hitherto been used; to reduceto a miniuuuu the clearance spaces in the eut-oli' ports and the expansion of steam therein; and a still `tui-ther object is to secure an adjustable cut-oitl mechanism.

ln the dr-.nvings7 Figure 1 is a section transverse to the steam cylinder. Fig. 2 is a section longitudinally of the cylinder and on the line of the valve rod. Fig. 3 is a plan otthe Yalve seat on the steam cylinder showing port connections. F 4 is a plan oit' the main slide valve, and Fig. 5 is a detail in plan ot' the cut-oil valve gear and auxiliary valve.

ln Fig. 1, the .main cylinder is indicated at 107 and the main piston is partly shown at 1l in Fig. 2. The valve seat 12 of the main cylinder is equipped with three main ports, 13 and lll being the inlet ports and 15 the exhaust port. The main slide valve 11G is moved by an auxiliary piston 17 inclosed in the auxiliary steam cylinder 18. The cylinder 1S is shown positioned at right angles to the axial line of the main cylinder which it surmounts, and this is the preierred arrangement although not essential to the broader features of the invention.

The central portion of the valve piston 17 is ot' a reduced semi-eylindrieal cross-section as shown in Figs. 1 and 2, and in the space thus termed between the valve piston and the main slide valve 1G, the auxiliary valve 1S) and the cut-oil valve and gear 3l, 4.6, 35, 47 are located. The auxiliary valve controls the admission and exhaust to and from the valve piston and is moved by a shouldered block i8 forming` a part of the cut-oil' valve gear between the shoulders of which the auxiliary valve is loosely inclosed. The cuto'li' valve or valves 84;, 35 control the supply ol. steam passing through the main valve and they are moved as a unit by valve rod 21, which is `actuated in turn by the usual tappet arrangement1 not shown.

As best shown in Fig. 2 and Fig. 5, the auxiliary valve is located within the divided cut-oil valve. Both valves have their seats upon the upper t'ace oit the main slide valve 1G, and their movement, in line with the valve rod 2l, at right angles to the line o'l.c motion ol. the main slide valve 1G and the valve piston 17. The opening; and closing ol the ports et the auxiliary cylinder are determined by the combined movements of the auxiliary and the main slide valves, as will presently be described. ,As shown in ll`i`es. 2 and 5, the eut-olli' valves are shifted lo regulate the point oi cut-olf by means of a hand wheel lt which is keyed to a sleeve 43 which works in a bearing in bracket i-G. lu the end el the sleeve fl-3 is a block ft2 havingl a square hole in its center through which slides the end of the valve rod 21, `which is squared to [it this hole. On the valve rod are itted two split nuts 16, (117, one threaded righthaml and the other leiithand. The cut-oill valves Z13-t, 35 engage with the flanges ou the valve rod nuts 4G, 47 and l tui-ninel the valve rod moves the eutofl' valves together or apart accordino to t-he d1- rection in which the valve rod 1s rotated. lhe valve rod iS attached to the valve rod link by a swivel connection (not shown) to permit the rotation of the valve rod. A pointer t5 indicates the point oit cut-oli' upon a suitable scale.

lhst'erring7 now to Fig. 3, the seat of the main slide valve is shown as being equipped with seven ports. These ports are the main exhaust at 15, the two main inlets at 13 and 141-, the two starting ports 22 and 23 eentrolled by the main slide valve, and the two ports Qll and 9,5 communicating with the auxiliary cylinder. As is obvious, the arrangement of these ports is such also asvto secure in the usual way the preadmission of steam to prevent shock upon the beginning of' a piston stroke in the main cylinder, the pocket-ing of steam at the end of the stroke for the same reason, and also7 by means of the related ports, to cushion the movements of the auxiliary piston 17.

'lhe described mechanism operates as follows: assuming the auxiliary piston 17, as viewed in Fig. 1, to be in its extreme righthand position, as shown, it will be held in this position by steam admitted to the left of' the auxiliary piston through ports 241, 24 as shown in Figs. 1 and 2. rlhe main valve 16 will also be in a similar position and will allow steam to pass through ports 26, 27, 13 and 29 (Fig. 2) into the main cylinder 10, causing the piston 11 to move to the right. At the same time steam will exhaust through port 141 (F ig. 1) to the cavity 30 in main slide valve 16 and the central exhaust port 15.

At a predetermined point in the travel of the main piston 11, the usual tappet gear (not shown) will move the valve rod 21 to the right, viewed in Fig. 2. rllhe cut-off valve J-l attached thereto will thereupon close port 26, cutting ofil the supply of steam to the main piston, thus causing the steam to Work expansively during the remainder of the piston stroke.

As the cut-off valve closes port 26, the

`shouldered block 4.8 carried by the valve rod contacts with auxiliary valve 19, causing the latter valve to move to the right until port 25 in main'valve 16 is open to steam and port 24E open to the exhaust cavity 31 in auxiliary valve 1,9. Steam is now exhausted from the left of the auxiliary piston 17 through the channel indicated generally by 24, 24, While at the same time steam is admitted through the opposed ports indicated at 25. rllhis causes the auxiliary piston and main slide valve to move to the left until the port 24e in the main valve is closed to ex- `l'iaust by the edge of. the cavity 31 in the auxiliary valve 19. The port 24, being closed, the auxiliary piston cushions on the steam confined between its end and the auxiliary cylinder head, and comes to rest with the main slide valve in the proper position for the return stroke of the main piston.

It it be desired to have the steam follow full stroke in the main steam cylinder, as in Warming up, it may be accomplished by movingthe cut-off valves 34, 85 apart by handivheel del. Then the cut-off valves are separated the maximum distance they Will not entirely close the cut-off ports during the stroke of the main piston.

rIhe construction as thus shown and described is the preferred embodiment of the invention; but it will be understood that the invention is not limited to the specific arrangement otl parts illustrated, but that the broader' features of the invention, as defined by the claims, may be embodied in other constructions.

The construction shown and described herein includes certain features claimed broadly in my prior applications, Serial No. 659,501, filed November 10th, 1911 now Letters Patent No. 1,055,997; No. 659,968,

`filed November 13th, 1911 noW Letters Patent No. 1,055,994; No. 686,562, filed March 27, 1912, now Letters .Patent No. 1,055,996

and No. 686,568, filed March 27, 1912.

llhat is claimed is 1. In combination, a main slide valve, fluid actuated means to move said valve, an auxiliary valve controlling the fluid actuated means, and an adjustable cut-oil valve mechanism controlling both the movement of the auxiliary valve and the supply of fluid to the main slide valve.

2. In combination, a main cylinder, a main slide valve, an auxiliary cylinder, an auxiliary piston located Within the auxiliary cylinder and controlling they main slide valve, an adjustable cut-off valve mechanism controlling the movement of fluid to the main slide valve, an auxiliary valve controlling the movement of Huid to the auxiliary cylinder, the said auxiliary valve being controlled by the movement of the cut-off valve mechanism.

3. In combination, a main slide valve, fluid actuating means to move said valve, an auxiliary valve controlling the fluid actuated means, an adjustable cut-off valve, and a valve rod moving` both the auxiliary valve and cut-off valve.

41. In combination, a main slide valve, fluid actuated means to move said valve, an auxiliary valve controlling the fluid actuated means, an adjust-able cut-oft' valve, and a valve rod moving both the auxiliary valve and cut-off valve, the said eut-off valve being adjustable Without affecting the position of the auxiliary valve.

5. In combination, a main slide valve, fluid actuated means to move said valve, an auxiliary valve controlling the fluid actuated means, an adjustable cut-off valve, and a single valve seat having ports for said auxiliary valve and cut-off valve.

6. In combination, a fluid actuated valve gear including an auxiliary cylinder, an auxiliary piston, a main slide valve attached to and moved by the piston, an auxiliary slide valve, an adjustable cut-off valve, the said auxiliary slide valve and the cut-off valve being mounted upon the main slide valve and nested in said piston, but having their respective movements independent of t-he piston.

7. In combination, a fluid actuated valve gear including an auxiliary cylinder, an auxiliary piston, a main slide valve attached to and moved by said piston, an auxiliary slide valve, and an adjustable cut-off valve, the said auxiliary slide valve and the cutoff valve being mounted upon the main slide 6 valve and located between the main Slide valve and the auxiliary piston.

8. In combination, a main slide valve,`

fluid actuated means to move said valve, an auxiliary valve controlling the fluid actu- :10 ated means, and :in adjustable cut-oidI valve mechanism controlling both the movement of the auxiliary valve and the supply of fluid to tlie main slide Valve, the said auxiliary valve and cut-ofi valve mechanism being located between the fluid actuated means l and the main slide valve.

In testimony Wliei'eot, I have hereunto set my hand, in tlic presence of two subscribing Witnesses.

GEORGE P. ABORN.

lVitnesses:

CHARLES CHAPMAN, JOHN J. FiNLnY.

Copies ot this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C. 

